<!--父级组件：控制出登录页以外所有页面的共有头部与左侧菜单栏-->
<template>
  <div style="display: flex">
    <div :style="{width:(isCollapse ? '64px' : '208px')}">
<!--      左侧菜单栏 :collapse-transition是关闭折叠过程的渐变过程-->
      <el-menu
      background-color="#3c82f5"
      style="width:100%;height: 100vh;"
      text-color="#fff"
      active-text-color="#ff0"
      unique-opened
      :collapse="isCollapse"
      :collapse-transition="false"
      router
      >
<!--        左侧菜单栏顶部条-->
        <el-row style="padding-top:10px;">
          <el-col :span="2"></el-col>
          <el-col :span="7" style="padding-left: 8px">
            <el-avatar src="/imgs/admin/logo.png" style="width: 35px;height: 35px;"></el-avatar>
          </el-col>
          <el-col :span="isCollapse ? 0 : 13">
            <span style="color:#fff;font-weight: bold;position: relative;top:8px;left: 8px;">
              智慧车辆
            </span>
          </el-col>
        </el-row>
        <el-sub-menu index="1">
          <template #title>
            <el-icon style="font-size: 21px;"><User/></el-icon>
            <span>用户管理</span>
          </template>
          <el-menu-item index="/user">用户列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="2">
          <template #title>
            <el-icon style="font-size: 21px;"><Van/></el-icon>
            <span>车辆管理</span>
          </template>
          <el-menu-item index="/vehicle">车辆列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="3">
          <template #title>
            <el-icon style="font-size: 21px;"><Location /></el-icon>
            <span>围栏管理</span>
          </template>
          <el-menu-item index="/geofence">电子围栏</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="4">
          <template #title>
            <el-icon style="font-size: 21px;"><Place/></el-icon>
            <span>调度管理</span>
          </template>
          <el-menu-item index="/application">用车申请</el-menu-item>
          <el-menu-item index="/audit">用车审批</el-menu-item>
          <el-menu-item index="/distribute">车辆分配</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="5">
          <template #title>
            <el-icon style="font-size: 21px;"><MessageBox/></el-icon>
            <span>字典管理</span>
          </template>
          <el-menu-item index="/dict">字典列表</el-menu-item>
        </el-sub-menu>
      </el-menu>
    </div>
    <div :style="{width:(isCollapse ? 'calc(100% - 64px)': 'calc(100% - 208px)')}">
<!--     右侧顶部条 -->
      <el-header style="height: 10vh;background-color: #fff;padding-top: 22px;">
        <el-row>
          <el-col :span="18">
            <el-icon style="font-size: 21px" @click="changeCllopsed"><Expand/></el-icon>
          </el-col>
          <el-col :span="6" style="position: relative;">
            <el-dropdown trigger="click" style="position:absolute;right: 20px;">
              <span style="font-size: 19px;font-weight: bold;">
               {{ user.username }}
                <el-icon><arrow-down/></el-icon>
              </span>
              <template #dropdown>
                <el-dropdown-menu>
                  <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </template>
            </el-dropdown>
          </el-col>
        </el-row>
        <!--          右侧顶部条：面包屑导航-->
        <el-breadcrumb separator="/" style="position: relative;top: 20px;">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadcrumb">{{item}}</el-breadcrumb-item>

        </el-breadcrumb>
      </el-header>
      <el-main style="height: 90vh;padding: 0;overflow-y: auto; ">
        <!--     右侧可变区域 -->
        <router-view/>
      </el-main>


    </div>
  </div>
</template>

<script setup>
import {onMounted, ref} from 'vue';
import {useRoute, useRouter} from "vue-router";

//定义变量用来控制左侧菜单栏是否折叠
const isCollapse = ref(false);
//定义处理左侧菜单栏折叠的方法
const changeCllopsed = () => {
  isCollapse.value = !isCollapse.value;
};
const user = ref(getUser());
const logout = () => {
  if(confirm("您确定要退出登录吗？"))
  localStorage.removeItem('user');
  //跳转到登录页
  window.location.href='/login';
  //清空取出来的user数据
  user.value ='';
};
//定义数组用来保存当前面包屑导航显示的值
const breadcrumb = ref([]);

//定义对象用来保存path与面包屑的对应关系
let map={
  '/user':['用户管理','用户列表'],
  '/vehicle':['车辆管理','车辆列表'],
  '/geofence':['围栏管理','电子围栏'],
  '/application':['调度管理','申请列表'],
  '/audit':['调度管理','调度审核'],
  '/distribute':['调度管理','用车分配'],
  '/dict':['字典管理','字典列表'],
  '/geofenceMap':['围栏管理','围栏绘制']
}
//useRoute()是Vue-Router提供的一个方法，用于获取当前路由对象
const route = useRoute();
//自定义更新面包屑的方法
const updateBreadcrumb = (route) => {
  //从当前路由对象中获取当前的路劲path
  const path = route.path;
  //根据path更新面包屑显示的值
  breadcrumb.value = map[path];
}
//一进入页面就立即调用更新面包屑导航值的函数，但是只有在第一次进入页面时会调用
onMounted(() =>{
  updateBreadcrumb(route);
})
//获取路由守卫，监听路由，只要path发生了改变（包含点击左侧菜单栏），就立即更新面包屑
const router=useRouter();
router.beforeEach((to,from,next)=>{
  updateBreadcrumb(to);
  next();
})
</script>
